1  /* Definitions for PA_RISC with ELF format on 64-bit Linux
       2     Copyright (C) 1999-2023 Free Software Foundation, Inc.
       3  
       4  This file is part of GCC.
       5  
       6  GCC is free software; you can redistribute it and/or modify
       7  it under the terms of the GNU General Public License as published by
       8  the Free Software Foundation; either version 3, or (at your option)
       9  any later version.
      10  
      11  GCC is distributed in the hope that it will be useful,
      12  but WITHOUT ANY WARRANTY; without even the implied warranty of
      13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14  GNU General Public License for more details.
      15  
      16  You should have received a copy of the GNU General Public License
      17  along with GCC; see the file COPYING3.  If not see
      18  <http://www.gnu.org/licenses/>.  */
      19  
      20  #if 0 /* needs some work :-( */
      21  /* If defined, this macro specifies a table of register pairs used to
      22     eliminate unneeded registers that point into the stack frame.  */
      23  
      24  #define ELIMINABLE_REGS							\
      25  {									\
      26    {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM},				\
      27    {ARG_POINTER_REGNUM,	 STACK_POINTER_REGNUM},				\
      28    {ARG_POINTER_REGNUM,	 FRAME_POINTER_REGNUM},				\
      29  }
      30  
      31  /* This macro returns the initial difference between the specified pair
      32     of registers.  */
      33  #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
      34    do								\
      35      {								\
      36        int fsize;						\
      37  								\
      38        fsize = pa_compute_frame_size (get_frame_size (), 0);	\
      39        if ((TO) == FRAME_POINTER_REGNUM				\
      40  	  && (FROM) == ARG_POINTER_REGNUM)			\
      41  	{							\
      42  	  (OFFSET) = -16;					\
      43  	  break;						\
      44  	}							\
      45  								\
      46        gcc_assert ((TO) == STACK_POINTER_REGNUM);		\
      47  								\
      48        switch (FROM)						\
      49  	{							\
      50  	case FRAME_POINTER_REGNUM:				\
      51  	  (OFFSET) = - fsize;					\
      52  	  break;						\
      53  								\
      54  	case ARG_POINTER_REGNUM:				\
      55  	  (OFFSET) = - fsize - 16;				\
      56  	  break;						\
      57  								\
      58  	default:						\
      59  	  gcc_unreachable ();					\
      60  	}							\
      61      } while (0)
      62  #endif